Composition of matter and method of producing the same



PatentedfAeg; i12,` 1930 Y 'i ISG-MQMTION,@merengues 031mm Jassen, A 'f coivrrosxzrion QFimmimmlmmgog@ ,mpjg/GTagungs t Naprwiiefi j, Ae ieweufknewn tetneeeieieiieegie ehem; cainplior is Vthe 'principal soliiil;'solvent-01%l mires Wapen, orgiies ORANGE; Ama :H'Ann E. `sivmri ANDL maximo .F. mimic;

or NEWARK; NEW JERSEY; ASSIGNORsi ,Br `ilitnlezln ASSIGNMENTS, To" cELLUL-oim;

i plastieizei 'for.pyroxylineoinjjounds which leave al hardened "mass orc film upon evapciae;l tionvr 01 theliquidconstituents. v :N evethelelss,` `eaniphoi"has Voer-tain ydisadvantages whfioh variousinentois; hayfeasoughtfto o hiate by adlnngtui'e therewith of l other substances which serveto modify its. properties a'ndae- Jfion. Its highY oost and Athreatened scarcity? Y f y grind oui pyroxylm and plastioiaei'ac'eorde-;

- aire alsoreasons onusilig lower'piopoiftions Y makes it vmore erless diilieult to mio boloration androtheifdefeotsgin the ula ritioniof stiffenediles A process oljrolline, presses and mlinge l t y ions tooainpholf., employment fandv attendant diiiioulties Vare.

phthalate totWo 'effect-ive Y .1 Dibutylfphtlialate litself` as a@pyrffixylinl plastioizer We iind has 'certain Obj eetienableY.l

- made possible by' A oornloinationsa which leave its usefulness* Among` the disadvantages "o sic-height" oa f `piana eine piee'ieizing @geen` ere edel e j V Volatility Wliiehresultsin warpingeif shrink-i* over'ooin'e by adding to the camphonsuiiicient A diloiityl phthalate, oi other simple alkyl-ester, 0fphthalioaoid- Y Foi example,agconiloinaj` tion of aboutequal parts offeaniphorand dibutyl phthalatey makes a vey desiraloleL niiX- ture, 1 loutv o'r'cases `Wliioh vmerely require a i lowering of,l the softening pointjof thefcam;` plier to "produce easier plasticity,-We1have` found, thatfthe tuse Vof one part dibutyl parts of oamphoizisvery y d e "al'iti-giind-the"dibuthybphtlialate lwithtli'eV irpjxroX-ylfingsay ten'paitstofth'e hundred OBF uyioXylin; fdry basis`, and alter` thesainejliaf y beelifxdehydratedhy` exposureaor othei'WifSeg j we,atltlftlieeamploi7 say,twentyiparts "prefy` erablydSSOlvediwththe liquidi'solvents,alcov()` u i features 'common to `many' camphoivsubsti- .tutes; VFor one vthing,` (it :is deficientinsolient powei,. ,tlifus' i adding f to" oolloidalf diiiiculties .and vadversely alieoting that penetration Wliikoliis important tothe homogeneity ofthe VneCessitatesia'jniore`liberal use of assooizited i i pyroxylinecoinloination..V4 But inspit'e of these ni pairing] for improvedlf www efeeeepfberie.see@ eej-sue be@ vagents a'sjstabilizers and adulteifant mater sea-roh. Iii otherf'words We overcoin Ath olijeetiiiable features of yotll Vsubstan s see-h improvements pefeieeieriygeree ef e the incorporation lprocess, for We prefer to.

ing to that Celluloid praeticefwhieh aimsatf f ehereu-g'hinifiei mixing We are enabled te Y :do this Withou'tlethe usual attendantelossofi eamphorgebyiirstgrinding thedibutiyl jahtlialate oiothisimle alkyl QeStex Q phthalie j acid Witli the in oist pyroxylin and then adding'our ,eaniphor tofthe resultant cake ai'terl` I t I Y i' le the impeevereeu offene 31902" Y cailnphor solvent by associating it with a simple alkyl ester of phthalic acid and contraril the yroxylin menstrua used to liquefy it or volatile.` solvent. should, "of course,be com-V ren er it suitable for plastic operations. The

patible with pyroxylin and the camphorated lasticizer. By pyroxylin We mean the solul le variety of nitro-cellulose yusually emj;

' well as that used for varnishes,photo-filmsp l l `"'or'a longer time. `The products are less ployed forfcellnloid or -siinilar plastics, as*

and protective coatings. I

1 i, By camphor-vve mean'either the natural,

artiicialor synthetic variety, and by dihutylr` phthalate We mean thecommerciallypure normal substance. Howevenany of the sim#` ple-,alkylles'ters of phthalic acid may be ad vantageouslyused in -combination vvithcam-y atogproduce .a compositionfoil desirable qualities. Bysirnple alkyl esters of phthalicg v acidwe'meanfsubstances of the type indicated 4o c 4 VKofthe mixturefare'zbest tov avoid undesirable [by the following formulae, in which ,R andV `When making pyroiylin compounds high-, er in liquid 'solvent-1content than those :fwe y have described for sheets, rods, tubes, etc.,

Y.andfthejlikevelrid itfalsofadvantag'eousto employeur camphor-phthalate plasticizer;

Ri represent alkyl' groups containing less, 1

. .f pound'c'omprisinga coinpositionvof pyrozryy lin, camphor :and `asiinple alkyl-ester of phthalate acid'ivherethe alkyl radicals; con- Y tain lessfthan six carbon atoms, Which-"coinl Y. sistsinfmixing ten parts dibutyl phthalate.

Y. `dry basisfand afterwardsqremoving t ter kth or less degree, even with such a departure from the practices We recommen l.

By camphor, in the foregoing specifica-y tion, we'mean gum camphor or common came phor forL commerce, either the natural kind orV its equivalent by synthetic production.

The final pyroxylin4 compositions thus plasticized with camphor and dibutyl phthalate show easily Inouldable properties, infact more so than if camphor had been used alone. Sheetsmade with this mixed plasticizerhave also a higher degree of pliability than those made Withstraight.ca'mphon andwhen subjectedto severe tests, retain their flexibility,

phthalate.

2. The processof making apyr-O'Xylin corn-y With one hundred parts. hydrous pyroxylin,

he Wal refr'omyand then adding twenty parts eamphor'dissolved with solvents. i

i vJAlYIlhSIF. WALSH. HARRYE. SMITH@ AMERIGO F.';C;APRIO. l i

butgvvefind as viellA that moderate proportions v l softness Qryp1iabi1ay ;in. ehemalige-effe@ Y 1 nishes,' lacqu'ers, or filmidopesare sulliciefn'tly2 eyaporationf The liquid 'solvents forgv'arf-z* tions unnecessary. It is suflicient to v.point oa'frhapforta hard wenn.deposit-we Y i Vrecimlrrierld that the total proportionof thirty parts of 2 camphor-fl .dibutyl phthalate be notexceededgbut.rather lowered; unle'ss,fof= Y, course, a.; positive pliability be desired.: Thef j 'liquidycompounds employing -the'xcamphor phthalate combination are also very useful as?y cemnting agents for pyroxylin plastics@k v (Whilewe' recommend for'fthese lovv'ableso` lutions Ja basic ingredientv consisting of." theV difie'd-ly wpyroxylin-camphor-'dibutyl phthalate 'masser cake thinnedidown or renderedliq y. nidby the addition of ysuitable,volatilemerg] i 'st rua,"the'1 nain' object of our inventioncan be kaccompli she'djin thisfinstance miningtogether-elliot fthe ingredients at', onejopera tifonjfor thelproperties of ournevv compound .plastid??willssertfhemselves ,tp a greater CERTIFICATE 0F CORRECTION.

Patent No. 1,772,529. Granted August 12, 1930, to

JAMES F. WALSH ET AL.

It is hereby certified that erroreppears in the printed specification of the above numbered patent requiring correction as follows: Page 2, lines 92 to 95, Jclaim 2, strike out the words "comprising a composition of pyroxylin, camphor and a simple alkyl ester of phthalate acid where the alkyl .radicals contain less than six carbon atoms,"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 23rd day of September, A. D. 1930.

, M. J. Moore, (Seal) Acting Commissioner of Patents. 

